(19)

(11)

EP 2 446 117 A2

(12)

(88) Date of publication A3: 24.02.2011 (43) Date of publication: 02.05.2012 Bulletin 2012/18 (21) Application number: 10792660.2 (22) Date of filing: 24.06.2010

(51) International Patent Classification (IPC):  E21B 49/10(2006.01) E21B 43/00(2006.01) B63C 11/48(2006.01) (86) International application number: PCT/US2010/039808 (87) International publication number: WO 2010/151661 (29.12.2010 Gazette 2010/52)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 25.06.2009 US 220466 P (71) Applicant: Cameron International Corporation Houston, TX 77027 (US)	(72) Inventors: CUMMING, Mike Kirbymoorside York YO62 6DP (GB) DAWSON, Alan Peterculter Aberdeen AB14 0SQ (GB) OSBORNE, Roger Houston Texas 77024 (US) (74) Representative: Akers, Noel James  N.J. Akers & Co 63 Lemon Street Truro, TR1 2PN Truro, TR1 2PN (GB)